Yes and no The story with regards Bill Gates scheduling classes is true, mostly becausealthough if this would be considered "tampering" really isn't the right wordis best left to usethe reader. According to Bill Gates, he actually wrote a computerized class scheduler for Lackside School in which he included an extra feature,
Of course, a whole new dimension of relevance came when I was asked to do a computerized class schedule for the high school.
It was complex, but ultimately very rewarding. By the time I was done, I found that I had no classes at all on Fridays. And even better, there was a disproportionate number of interesting girls in all my classes.
This is also corroborated in an interview with the BBC that he did. According to a Wired time-line line on Bill Gates, this took place in 1971 so he would have been 15 to 16 years old at the time and was already engaged in quite a bit of work at the time that he was being paid for as well.
In one sense the undocumented feature that he added could be considered anything ranging from an Easter egg to a backdoor but. However, since he was asked to write the software it wasn't tampering per se even though it is against the code of ethics of most professional societies.